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The year he turned 19, Blaise Pascal started work on a mechanical calculator. He finished it three years later. It was not to help his dad prepare his personal taxes, it was to help in his father's work as a tax collector. Building a mechanical calculator is pretty amazing in and of itself, but consider these two things: 1) That Blaise had not been allowed to read about or study mathematics as a child until, at age 12, he showed his dad that he had figured out some geometry on his own, and 2) That this all happened about 350 years ago.

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Q: What type of machine did 19-year-old French genius Blaise Pascal invent to help his dad do taxes in?
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